LT 3033 malfunctioning

Hello,

I am trying to test the IC : LT 3033. It has a linear regulator with a internal reference voltage of 0.2V. I had set feedback resistors of 150K and 11k to expect an output of 2.9V approx. However I am getting an output voltage of 0.48V at a supply of 4.5V. Also the output voltage is increasing with increase in input voltage. I am attaching the datasheet and a zip file of board and schematic files that I have created in Autodesk eagle 9.1.

lt3033.zipPDF

Parents
    •  Analog Employees 
    on Oct 4, 2018 6:38 PM

    There are no input/output capacitors in your schematic. The minimum output capacitor is 10uF for LT3033, and a 10uF cap is needed at the input. Remove C2 that is in parallel with the bottom feedback resistor to keep the system stable.

Reply
    •  Analog Employees 
    on Oct 4, 2018 6:38 PM

    There are no input/output capacitors in your schematic. The minimum output capacitor is 10uF for LT3033, and a 10uF cap is needed at the input. Remove C2 that is in parallel with the bottom feedback resistor to keep the system stable.

Children